EP0536162B1 - Armature for high-speed forced-ventilation electric motors running in air containing abrasive dust - Google Patents

Armature for high-speed forced-ventilation electric motors running in air containing abrasive dust Download PDF

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Publication number
EP0536162B1
EP0536162B1 EP91909956A EP91909956A EP0536162B1 EP 0536162 B1 EP0536162 B1 EP 0536162B1 EP 91909956 A EP91909956 A EP 91909956A EP 91909956 A EP91909956 A EP 91909956A EP 0536162 B1 EP0536162 B1 EP 0536162B1
Authority
EP
European Patent Office
Prior art keywords
armature
winding
slot seals
slots
abrasive dust
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91909956A
Other languages
German (de)
French (fr)
Other versions
EP0536162A1 (en
Inventor
Manfred Kirn
Werner Grammer
Gerhard KRÄMER
Meinhard Eule
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0536162A1 publication Critical patent/EP0536162A1/en
Application granted granted Critical
Publication of EP0536162B1 publication Critical patent/EP0536162B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/48—Fastening of windings on the stator or rotor structure in slots
    • H02K3/487—Slot-closing devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
    • H02K3/51—Fastening of winding heads, equalising connectors, or connections thereto applicable to rotors only

Definitions

  • the invention relates to an anchor with the features of the preamble of claim 1.
  • An anchor that comes close to the genus of the invention is known from DE-AS 1 538 908.
  • this armature has a relatively securely fixed, against centrifugal forces secured transition of the winding between a winding head and a commutator, the winding heads or the windings located in the grooves of the armature core package are not secured by separate means.
  • Anchors designed in this way do not withstand the loads to which modern power tools are exposed, since they are overwhelmed with bumps and vibrations, such as occur on impact drills or angle grinders.
  • there is the usual high load in such machines due to ambient air containing abrasive dust, which is used for forced cooling, by means of which the winding heads are ground and the armature is destroyed.
  • Anchors with the characterizing features of claim 1 have the advantage that a reinforcement consisting of the previously usual slot closures is particularly easy to manufacture. This can absorb the strong mechanical vibrations that loosen or tear the winding, as occurs, for example, when used in impact drills or angle grinders. However, it also protects the end windings against grinding by cooling air containing abrasive dust as well as against the effect of centrifugal forces at maximum speeds of the armature and additionally improves the cooling of the electric motor due to the fan action of the rib-like beads on the end windings.
  • An embodiment of an armature 1 shown in the drawing consists of an armature shaft 3, which carries an armature lamination stack 5 with grooves 7. Windings consisting of an electrical conductor are guided through the grooves 7 and form winding heads 9, 11 on the end face of the anchor or are connected at their ends to a collector 13.
  • the grooves 7 are filled with groove closures 15 treated with trickling resin.
  • the slot closures 15 consist of approximately 3 mm thick paper knit or textile fabric and are pressed into the slots 7 so that the windings are held firmly on the slot base and cannot move out of the slots 7 even with high centrifugal forces.
  • the ends of the slot closures 15 are held on the waist of the end windings by means of a cord winding 17 and thus form a rib-like reinforcement of the anchor end faces or the end windings 9, 11.
  • the cord winding is formed by one or more excessively long slot closures, the excess length of which is looped and fixed one or more times around the waist of the winding over the ends of the slot closures, for example by knots or gluing.
  • rings for example rubber rings, can be arranged, which are seated on the ends of the slot fasteners and the smallest diameters of the winding overhangs by appropriate elasticity and pretension or by deformation.
  • slot closures are made of plastic material which can be deformed for a limited time after being fastened to the anchor and are adapted to the contours of the winding overhangs or for a possible flow improvement, e.g. to increase the fan effect, can be changed.
  • the slot closures (15) are wetted with trickling resin, so that there is a particularly firm connection between the slot closures and the winding heads.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Windings For Motors And Generators (AREA)

Abstract

For an armature (1) for high-speed forced ventilation electric motors running in air containing abrasive dust, especially in electric tools, preferably angle sanders, with windings fitted in grooves (7) of a set of armature plates which are held down in the grooves (7) by longitudinal elastic groove closures (15) and form winding heads (9, 11) at the front ends of the armature, it is proposed that, in order to increase the sturdiness of the armature winding and its resistance to abrasive dust and to improve cooling, the groove closures (15) project beyond the grooves (7), follow the contour of the winding heads (9, 11) especially along generating lines in the longitudinal direction of the armature and extend to the front ends of the armature (1) where their ends are bunched.

Description

Stand der TechnikState of the art

Die Erfindung betrifft einen Anker mit den Merkmalen des Oberbegriffs des Anspruchs 1.The invention relates to an anchor with the features of the preamble of claim 1.

Ein der Gattung der Erfindung nahekommender Anker ist aus der DE-AS 1 538 908 bekannt. Dieser Anker hat zwar einen verhältnismäßig sicher fixierten, gegen Fliehkräfte gesicherten Übergang der Wicklung zwischen einem Wickelkopf und einem Kommutator, jedoch sind die Wickelköpfe bzw. die in den Nuten des Ankerblechpaketes liegenden Wicklungen nicht durch gesonderte Mittel gesichert. Derartig ausgestaltete Anker halten den Belastungen, denen moderne Elektrowerkzeuge ausgesetzt sind, nicht stand, da sie mit Prellschlägen und Schwingungen, wie sie beispielsweise an Schlagbohrmaschinen oder Winkelschleifern auftreten, überfordert sind. Hinzu kommt die bei derartigen Maschinen übliche hohe Belastung durch abrasivstaubhaltige Umgebungsluft, die zur Zwangskühlung verwendet wird, durch die die Wickelköpfe abgeschliffen und so der Anker zerstört wird.An anchor that comes close to the genus of the invention is known from DE-AS 1 538 908. Although this armature has a relatively securely fixed, against centrifugal forces secured transition of the winding between a winding head and a commutator, the winding heads or the windings located in the grooves of the armature core package are not secured by separate means. Anchors designed in this way do not withstand the loads to which modern power tools are exposed, since they are overwhelmed with bumps and vibrations, such as occur on impact drills or angle grinders. In addition, there is the usual high load in such machines due to ambient air containing abrasive dust, which is used for forced cooling, by means of which the winding heads are ground and the armature is destroyed.

Vorteile der ErfindungAdvantages of the invention

Anker mit den kennzeichnenden Merkmalen des Anspruchs 1 haben den Vorteil, daß eine aus den bisher ohnehin üblichen Nutverschlüssen bestehende Armierung besonders einfach herstellbar ist. Diese kann die die Wicklung lockernden oder zerreißenden, starken mechanischen Schwingungen aufnehmen, wie sie beispielsweise bei Verwendung in Schlagbohrmaschinen oder Winkelschleifern auftreten. Sie schützt aber auch die Wickelköpfe sowohl gegen Abschleifen durch abrasivstaubhaltige Kühlluft als auch gegen die Wirkung von Fliehkräften bei Höchstdrehzahlen des Ankers und verbessert zusätzlich die Kühlung des Elektromotors infolge der Ventilatorwirkung der rippenartigen Wülste auf den Wickelköpfen.Anchors with the characterizing features of claim 1 have the advantage that a reinforcement consisting of the previously usual slot closures is particularly easy to manufacture. This can absorb the strong mechanical vibrations that loosen or tear the winding, as occurs, for example, when used in impact drills or angle grinders. However, it also protects the end windings against grinding by cooling air containing abrasive dust as well as against the effect of centrifugal forces at maximum speeds of the armature and additionally improves the cooling of the electric motor due to the fan action of the rib-like beads on the end windings.

Die Merkmale der folgenden Ansprüche dienen der vorteilhaften Ausgestaltung derErfindung.The features of the following claims serve to advantageously configure the invention.

Zeichnungdrawing

Die Erfindung ist nachstehend in der Beschreibung anhand einer zugehörigen Zeichnung erläutert.The invention is explained below in the description with reference to an accompanying drawing.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Ein in der Zeichnung gezeigtes Ausführungsbeispiel eines Ankers 1 besteht aus einer Ankerwelle 3, die ein Ankerblechpaket 5 mit Nuten 7 trägt. Durch die Nuten 7 sind aus einem elektrischen Leiter bestehende Wicklungen geführt, die ankerstirnseitige Wickelköpfe 9, 11 bilden bzw. mit ihren Enden an einen Kollektor 13 angeschlossen sind.An embodiment of an armature 1 shown in the drawing consists of an armature shaft 3, which carries an armature lamination stack 5 with grooves 7. Windings consisting of an electrical conductor are guided through the grooves 7 and form winding heads 9, 11 on the end face of the anchor or are connected at their ends to a collector 13.

Die Nuten 7 sind mit mit Träufelharz behandelten Nutverschlüssen 15 ausgefüllt. Die Nutverschlüsse 15 bestehen aus etwa 3mm starkem Papierstrick oder Textilgewebestrick und sind in die Nuten 7 eingepreßt, so daß die Wicklungen fest auf dem Nutgrund gehalten sind und sich auch bei hohen Fliehkräften nicht aus den Nuten 7 herausbewegen können. Die Enden der Nutverschlüsse 15 sind mittels einer Schnurwicklung 17 auf der Taille der Wickelköpfe gehalten und bilden so eine rippenartige Armierung der Ankerstirnseiten bzw. der Wickelköpfe 9, 11.The grooves 7 are filled with groove closures 15 treated with trickling resin. The slot closures 15 consist of approximately 3 mm thick paper knit or textile fabric and are pressed into the slots 7 so that the windings are held firmly on the slot base and cannot move out of the slots 7 even with high centrifugal forces. The ends of the slot closures 15 are held on the waist of the end windings by means of a cord winding 17 and thus form a rib-like reinforcement of the anchor end faces or the end windings 9, 11.

In einem weiteren, nichtdargestelltem Ausführungsbeispiel wird die Schnurwicklung durch ein oder mehrere überlange Nutverschlüsse gebildet, deren Überlänge ein- oder mehrfach um die Taillen der Wickelköpfe über den Enden der Nutverschlüssen geschlungen und fixiert sind, etwa durch Knoten oder Verkleben.In a further embodiment, not shown, the cord winding is formed by one or more excessively long slot closures, the excess length of which is looped and fixed one or more times around the waist of the winding over the ends of the slot closures, for example by knots or gluing.

In einem weiteren nichtdargestellten Ausführungsbeispiel können anstelle der Schnurwicklungen Ringe, beispielsweise Gummiringe, angeordnet sein, die durch entsprechende Elastizität und Vorspannung bzw. durch Verformen fest auf den Enden der Nutverschlüsse und den kleinesten Durchmessern der Wickelköpfe sitzen.In a further embodiment, not shown, instead of the cord windings, rings, for example rubber rings, can be arranged, which are seated on the ends of the slot fasteners and the smallest diameters of the winding overhangs by appropriate elasticity and pretension or by deformation.

Ein vorteilhaftes Ausführungsbeispiel ergibt sich dadurch, daß die Nutverschlüsse aus plastischem Werkstoff bestehen, der nach dem Befestigen auf dem Anker noch für eine begrenzte Zeit verformbar ist und den Konturen der Wickelköpfe entsprechend angepaßt werden bzw. für eine eventuelle Strömungsverbesserung, z.B. zur Erhöhung der Ventilatorwirkung, geändert werden kann.An advantageous embodiment results from the fact that the slot closures are made of plastic material which can be deformed for a limited time after being fastened to the anchor and are adapted to the contours of the winding overhangs or for a possible flow improvement, e.g. to increase the fan effect, can be changed.

Bei allen Ausführungsbeispielen sind die Nutverschlüsse (15) mit Träufelharz benetzt, so daß eine besonders feste Verbindung zwischen den Nutverschlüssen und den Wicklungsköpfen besteht.In all of the exemplary embodiments, the slot closures (15) are wetted with trickling resin, so that there is a particularly firm connection between the slot closures and the winding heads.

Claims (7)

  1. Armature (1) having an armature shaft (3) for high-speed electric motors which are force-ventilated in air containing abrasive dust and have a collector (13), in particular in electric tools, preferably right angle grinders, having windings which are laid in slots (7) of an armature laminate stack (5), which form on the end faces of the armature (1) winding overhangs (9, 11) which lead up to the armature shaft (3) having approximately spherical contour, and are held near the armature shaft (3) by a cord winding (17), characterised in that the windings are held down in the slots (7) by elongated, elastic slot seals (15), at least one, preferably a plurality, of the slot seals (15) following as a whole axially out over the slots (7) the contour of the winding overhangs (9, 11), in particular along surface lines, up to the armature shaft (3) in the armature longitudinal direction, forming rib-like bulges in the process, and being held likewise by the cord winding (17) on the end faces of the armature (1).
  2. Armature according to Claim 1, characterised in that the cord winding (17) is formed by one or more of the slot seals (15) themselves.
  3. Armature according to Claim 2, characterised in that rings fix the slot seals (15) on the end faces of the armature.
  4. Armature according to one of Claims 1 to 3, characterised in that the ends of the slot seals (15), the cord winding (17) and/or the rings are fixed in a solidified manner on the armature with impregnated resin.
  5. Armature according to one of Claims 1 to 4, characterised in that the slot seals (15) are strip-like or cord-like elements inserted into the armature slots (7).
  6. Armature according to one of Claims 1 to 5, characterised in that the slot seals (15) consist of knitted fibres.
  7. Armature according to one of Claims 1 to 6, characterised in that the slot seals (15) can be plastically deformed after insertion into the slots (7).
EP91909956A 1990-06-23 1991-05-28 Armature for high-speed forced-ventilation electric motors running in air containing abrasive dust Expired - Lifetime EP0536162B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE9007029U DE9007029U1 (en) 1990-06-23 1990-06-23 Armature for high-speed electric motors with forced ventilation in air containing abrasive dust
DE9007029U 1990-06-23
PCT/DE1991/000456 WO1992000626A1 (en) 1990-06-23 1991-05-28 Armature for high-speed forced-ventilation electric motors running in air containing abrasive dust

Publications (2)

Publication Number Publication Date
EP0536162A1 EP0536162A1 (en) 1993-04-14
EP0536162B1 true EP0536162B1 (en) 1995-02-01

Family

ID=6854877

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91909956A Expired - Lifetime EP0536162B1 (en) 1990-06-23 1991-05-28 Armature for high-speed forced-ventilation electric motors running in air containing abrasive dust

Country Status (7)

Country Link
US (1) US5352948A (en)
EP (1) EP0536162B1 (en)
JP (1) JP3105246B2 (en)
BR (1) BR9106590A (en)
DE (2) DE9007029U1 (en)
RU (1) RU2092956C1 (en)
WO (1) WO1992000626A1 (en)

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DE4029271A1 (en) * 1990-09-14 1992-03-19 Magnet Motor Gmbh ELECTRIC MACHINE
DE9209930U1 (en) * 1992-07-23 1993-02-25 Siemens AG, 8000 München Grooved anchor
JP3373695B2 (en) * 1995-05-24 2003-02-04 株式会社マキタ Power tool motor rotor
WO1999062166A1 (en) * 1998-05-28 1999-12-02 Robert Bosch Gmbh Rotor for an electrical motor and method for producing the same
DE19840149A1 (en) * 1998-09-03 2000-03-16 Atlas Copco Electric Tools Rotor device for electric machine, has shaft carrying iron lamination stack with slots carrying rotor winding, in which start and end of wires of respective coils are electrically connected at commutator lugs
ATE374443T1 (en) * 2001-01-09 2007-10-15 Black & Decker Inc ELECTRIC MOTOR WITH AN ARCHOR COATED WITH A THERMALLY CONDUCTIVE PLASTIC
US7814641B2 (en) 2001-01-09 2010-10-19 Black & Decker Inc. Method of forming a power tool
US20020089240A1 (en) 2001-01-09 2002-07-11 Du Hung T. Electric motor having armature coated with a thermally conductive plastic
US7096566B2 (en) 2001-01-09 2006-08-29 Black & Decker Inc. Method for making an encapsulated coil structure
CN100593278C (en) * 2004-11-26 2010-03-03 松下电器产业株式会社 Commutator motor manufacturing method
JP2007028743A (en) * 2005-07-14 2007-02-01 Hitachi Koki Co Ltd Rotor for commutator motors and power tool equipped with the same
FI118554B (en) * 2005-09-05 2007-12-14 Abb Oy Electric machine rotor
JP5152547B2 (en) * 2005-12-09 2013-02-27 日立工機株式会社 Commutator motor and electric tool using the same
DE102007053313A1 (en) 2007-11-08 2009-05-14 Robert Bosch Gmbh Armature for e.g. fast running electric motor for angle grinder, has protection device that is provided for coil ends, covers coil ends in area-by-area manner, and fixed to front-sided area of core body
DE102008043588A1 (en) * 2008-11-10 2010-05-12 Robert Bosch Gmbh Rotor of an electric machine with cord bandage
CN103095073B (en) * 2011-11-04 2015-08-19 苏州贝得科技有限公司 The fixing means that refrigerant compressor motor winding overhang insulate mutually
JP6227501B2 (en) * 2014-08-08 2017-11-08 株式会社日立製作所 Neutral ring of rotating electric machine and its manufacturing method

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GB190521A (en) * 1921-09-17 1922-12-18 Lancashire Dynamo & Motor Comp Improvements in dynamo-electric machines
US2078024A (en) * 1936-05-23 1937-04-20 Black & Decker Mfg Co Armature lead connection
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DE3842074C2 (en) * 1988-12-14 1997-02-13 Bosch Gmbh Robert Applying a winding head bandage made of glass fibers to the rotor of an electrical machine

Also Published As

Publication number Publication date
EP0536162A1 (en) 1993-04-14
DE9007029U1 (en) 1991-10-24
US5352948A (en) 1994-10-04
WO1992000626A1 (en) 1992-01-09
JP3105246B2 (en) 2000-10-30
DE59104509D1 (en) 1995-03-16
RU2092956C1 (en) 1997-10-10
BR9106590A (en) 1993-04-20
JPH05508530A (en) 1993-11-25

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